Machine for coating can ends



June 24, F. APRAHL ETF AL r MACHINE FOB COATING CAN ENDS l ,ff-5 9 N N N @D s ya ma. 'Y l. N mila g. l a Hull l L7 56 t? N lq Q i m w Mw s m QS qu June 24, 1930.

F. A. PRAHL ET AL MACHINE FOR COATING CAN ENDS Filed Feb l, 1928 June 24, 1930. F' A, PRAHL Er AL 1,768,144

MACHINE FOR COATING CAN ENDS Filed Feb, l, 1928 5 Sheets-Sheet '5 June 24, 1930. F A PRAHL Er Al. 1,768,144

MACHINE FOR COATING CAN ENDS Filed Feb. l. 192B 5 Sheets-Sheet 4 June 24, 1930. F, A, PRAHLT AL. l y 1,768,144

MACHINE FOR 'comme CAN ENDS Filed Feb. 1. '1928 5 sheets-sheet 5 f 1, lllll) Patented June 24, 1930 untren- ,sterne tat; ai vtro FREDERICK A. rnnirn, oF Yoan, N. Y., Aun nENnY A, Fink, oF oncneo, ILLrNois, seien-ons To oonfrivnurni. cnn coivrraNY, ine., OF nnw YORK, u. y.,

A conroaarion on Yoan MAcnirin non QOATING can nir-ns Application filed February 1, 1928. "SeralNa 251,092.`

a can end wherein the .coating is applied to the end by a nozzle disposed beneath the can end so that when the supply of the seal ing material to the nozzle is cut off, there will be no dripping or draining of the sealing material on to the can end.

A further object of ,the invention to provide a machine of the above type with means for giving an initial curl to the edge of the can end during the vcoating ofthe same.

In the drawings which show by way Vof illustration one embodiment. of the invention- Figure 1 is a sectional view through a machine embodying the improvement Figure 2k is an enlarged sectional view through the nozzle;

Figure 3` is a Adetail in plan showing more or less diagrammaticalfly the means for controlling vthe valve, whichin turn controls the discharge of the Sealing material from the nozzle;

Figure 4, is an enlarged sectional view showing the can end and the nozzle withthe material flowing from the-nozzle on to the can end; l

Figure 5 is a view similar'to Figure il, but showing the discharge of the `sealing material from the nozzle, cut olf Figure 6 is a side view of the machine shown in Figure l with parts broken away to show the means for giving an initial curl to the can end during the coating thereof;

Figure 7 is a plan view of the mechanism for moving the curling roll;

Figure 8 is a detail showing the can end before giving an initial curl thereto; and v Figure 9 is a view on an enlarged scale Showing e Perton 0i the Chucks, the @an end, and the curling roll for giving the initial curl to the edge of the canend.

The invention is directed to aY machine for coating can ends of the type disclosed in the patent to Robinson & Coyle No. 1,172,049, grantedFebruary 15, 1916.1In this patent, a can end to be coated is placed between two cooperating rotatingy chucks with the channel'to be coated facing downward. The 'sealing material is applied by means of a roll which makes rolling contact with the bottom of the channel in the can end, and thus applies la coating thereto. There is a limitation as to the character of sealing material which may thus be appli-ed tothe can end, and also a limitation as to the amount of sealing material that may be applied. The present invention is directed to an entirely different means of applying a sealing material to the can end. In the machine disclosed, the ycan end is placed be tween chucks and rotatedfl after the. manner described in the patent to Robinson & Coyle. The coating rolls, however, have been replaced by a different type of mechanism-for applying the sealing materialto the chan-nel in the can end. Located directly beneath the can end channel is anozzle. This nozzle projects into the channel, but is spaced from the bottom of the channel. The sealing materialis delivered to the nozzle from a supply tank by air pressure. The nozzle is provided with a valve o] oeratingY .at .the l discharge end of the nozzle for closing the same. The amount of sealing material applied to the can end will depend upon the length of time which the valve visopen. After the can end is placed, :and while it is rotating, the nozzle is opened, and the sealing material forced therefrom in a f jet against the bottom of the channel.y The nozzle sets back from the outer side of the channel, and the material asvit strikes Vthe bottom of the channel, due tothe centrifugal force operating thereon, will flow outward and completely ll the channel lining the curled edge of the can end.

n The machine is also provided with means for .forming an initial curl on the can end during 'the rotating of the @an endforcoat- .ice

ing the same. This is accomplished by a curling roll having a curved annulary therein, which curling roll is moved radially of the chucks into engagement with the edge of the can end. This curling roll is timed in its movement so as to engage the edge of the can end giving thereto a curved formation which is the beginning of the usual curl formed on a can end to aid in the forming of the double seam. This initial curl on the can end aids in the flow of the sealing material to the eXtreme edge of the can end and prevents the sealing material from being thrown from the can end during the rotation thereof. e

Referring more in detailY to the drawings, the invention is shown as applied to a can end coatingmachine which includes a supporting frame 1 having a central shaft 2. Mounted to rotate about this central shaft 2 is a sleeve 3 carrying a lcan end Vfeeding member Ll. This sleeve 3 is given an intermittent movement after the manner described in the patent. The shaft 2 is rotated by a suitable gear connection with the main shaft 5.

Mounted in the frame of the machine an upper chuck spindle 6 carrying a chuck 7. Also mounted in the'frame is a lower chuck spindle 8 carrying a lower chuck 9.

These chuck spindles are in axial alinement, and both spindles are mounted so that they may be moved up and down. The upper chuck spindle 6 carries a sprocket gear 10 which is rotated by a sprocket chain connection with a sprocket gear 11 on the upper end of the shaft 2. Through this sprocket gear connection to the shaft, the upper chuck is rotated, and when the upper chuck engages a can end placed on the lower chuck, then the lower chuck will rotate Y v therewith. This imparts a rotation to the can end clamped between the chucks.

vcan end is placed between the chucks by the The intermittently rotating can end feeding device 4. The can end is indicated in the drawings at C. The lower chuck spindle is mounted for free rotation, and is held raised by means of a spring 12, a stop collar 13 limiting the upward movement of the chuck spindle. When the lower chuck is at its extreme upper position, it is on a level so that the intermittent can end feed 4f will move the can end Von to the lower chuck. The upper chuck spindle is raised and lowered in its supporting bearing by means of a lever 1,4: pivoted at 15 vand connected to a memberv 16 which oscillates the lever. The member 16 carries a roller 16zt running in a cam groove 16b in a disc 16c on the shaft 5. These parts are shown in Fig. 1. The outer end of the lever 14: is connected to the chuck spindle so that the chuck spindle is free to be rotated. It is also connected to the spindle so that the spindle maybe shifted, and

thus properly setin its attachment to the lever. The up and down movements of the chuck are so timed relative to the feed of the can end that the upper chuck is raised, permitting the-can end to be movedunder-- neath the same and placed on the lower chuck, after which the upper chuck moves down on to the lower chuck and will depress the lower chuck to a certain extent.V The rotation of the chucks with the can end clamped between the same, thus produces a rotation of the can end. Directly beneath the channel in the canend and at one side of the lower chuck spindle is a coating noz-'- zle 17. This coating nozzle is shown in detail in Fig. 2. The nozzle is mounted in the supporting bracket 18 attached to the frame of the machine. The nozzle includes a supporting sleeve 19 into which is threaded an extension sleeve 20. A delivery nozzle 21 is attached to this extension sleeve by a nut 22. The delivery nozzle has a relatively small delivering opening 23. Located inside of the sleeves is a'needle valve 24 provided with a tapered end 25 adapted to engage a tapered seat at the inside of the delivery nozzle 21 and at the opening 23. Attached to the needle valve is a flexible diaphragm 26. The needle valve is adjustably attached to this diaphragm.

This needle valve is connected to a valve stem 27. The valve stem' is attached to a guiding piston 28 and is adapted to slide freely in the sleeve 19. A spring 29 bears against the piston28 and against the lower vend of the sleeve which is closed, except for the opening through which ythe stem passes. This spring normally raises the valve'stcm and forces the valve into contact with the seat at the nozzle end, thus closing the same. The sealing materialA is supplied to the nozzle from a suitable storage receptacle by a connection with a pipe 30 (see Fig. 1), which is threaded into an opening 31 in the wall ofthe extension sleeve 17. VThus it is that the sealing material is delivered under air pressure to the chamber 32. When the valve is open, the sealing material will be squirted or sprayed out of the end of the nozzle and in an upward direction. When, however, the needle valve is closed, then the supply is cutoff, and the discharge ceases `at once. v l f y The machine is also provided with means lfor giving an initial curl to the can end while the same is being rotated for the coating. This curling means is shown in Figures 7 to 9 inclusive. It includes a curling roll shown on an enlarged scale in Fig. 9, This curling roll 50 is provided with av curved annular groove 51. The can end is indicated at C. It is shown as clamped between the chucks 7 and 9. The curling roll is moved radially of the chucks into engagement with the can end C while the-can end isl .beine rotated. The @teveel curlingsreeve will sive aneitalcurlte the Cae. ,as indicated at C1., This .Curling- I'el' .s-Carried by 4a bar F2y which ismounted so that'it Ican slidein suitable ways carried by the frame of the machine. This han slides, in; line which passes through the center yf" IOIation of the chucks and thus it is-that the curling roll is moved radially of the chucks. This curling roll is mounted for free rotationv and when it is moved up into engagement with the edge of theV can endit Wil-l rotate and graduallyv turn `the edge into a Well cur-ved initial curl. l The bar carrying the curling rolll is moped endwise bymeans of a leser 53. This lever is forked atlower ,end and said forlzed end; straddles a pin 54 Whieh is attached to the 5,2; The cover plate slotted at lla-and the pin 54 projects through said slot. The lever is ypivoted at 55 to the side frame of the machine and projects above said pivot. The upper end of the lever is forked tis-indicated by dotted linesat 56. A pin carried by a bracket 58 engages. said upper forked end of the lever ,53. This bracket 58 is la ttacl-ed to a slide rod 59; The slide rod is` mounted so that it may be reciprocated in suitable bearing lugs 60, 6.0 which are attached to the frame et the machine This slide baris attached to a link 6lr which yin turnt is pivoted at 62- to an arm 63. mounted on the upper*- GILQL 0f a vertical shaft 64. This vertical shaft 6e. is mounted in suitable lbearings in; the. frame and is.4 oscillated by a slide rod 6 5 which is moved endwise by means of a roll S mounted thereon cooperating with.v an eccentrically set` member- (57 on ,the shaft 68.` A spring 69. Surrounding-the slide rod 52,) normal-ly forces the rod to the left as viewed in Fig.y 6. This. causes a movement of the upper .end of the lever 53 to the left and a moi/ement ofthe leave-r end of this lever to the righ-t. Thnsit is that the spring yieldingly, holds the` curling roll retracted;

'Yhen the shaft 6st oscillated inthe proper direction then the slide bar 59 is moved to the right asviewed in Figure, 6 and. this Wil-l positircly force the` curling rol-l into engagement with the edge of the end. The curling roll is timed' and operated soas to be held a suflieient length of time in engagement with the can end to causea Well delined initial curl on the .can end.y This initial curl also sizes up the can end toa predetermined size depending upon the ,extent of moyement imparted' to said curling. roll.

The machine 1s also provided with curling roll .6951. located at the` curling station C. (Figs. 6 and 7) which Ais of thetype shown in: the` patent to. Robinson .& Coyle referred toabove. This curling roll is.` likewise operT ated bythe oscillations of theshaft 64. This curling roll forms the. final part of. what @sieht be Calles the pre1-imitan. Curl; This preliminary curl on the can end protectsthe coating. material and also aidsin the proper formation of the double seam insuring that Athe can end When turned into the double seam is in-terfolded and locked with the flange on the can body. This curling roll 5.0might be called the auxiliary curling roll asy it performs its function first and at the same time when the coating is appliedto the can. end. In Figs. 6 and 7 the coating device is removed from the machine for the sake of clearness, but it is clearly shown in Fig. l. The coating nozzle is disposed directly in front of the Center line of the chucks as viewed in` this Fig. '6. In Figs, 8 and 9 there is shown the can end. as it comes from the die. press and the edge thereof is shown as bent away from the outer face of the end so as to provide the., channel c. Lherey isthe metaljat the outer edge ofv this channel that lis turnedinto the initial curl by the curling roll 50.

The sealing material is indicated; at Ir Fig. 4; the valve is slown as open and the nozzleis spraying or squirting the Sealing compound against the bottom of the channel c in the can end. It iS notedy that the nozzle is located a little up in the channel but is at the same time spaced from the bottom of the cli-annel.- It is also located a little toward the innerside of the channel. As a result the sealing material is sprayed or squirted against the bottom of the channel so as to form clean `out coating line c2. Inasmuch as the end is rotated when the sealingmatesi-al is thrown against the same the centrifugal forceacting thereon will cause saidk sealing material to flott; outwardly alongv the Wall of the channel and all the Way around the curled Outer edgeof the channel. When the extreme edge of the can iscurved so that the Wall :of the .Channel leads. directly into the curved inner face 'of thecurl the sealing material Will flow all the Way aromidv freely t0 the edge of the @an end. .It the' .can end isnot curved but shaped as shown. Fig. 8 then the sealing material is likely to be thrown from the can end. There is adyantage, therei'ore7 in curl-ing the can end at the same time or prior to the coating of the. same. This initial curl is formed in the present apparatus during the coating and the initial curll serves in a measure as a dam to stop the outward Viiow of the sealing material- It iS also coated' at the eXtreme ledge of the curled portion. When the valve Ais closed, the discharge of the sealing material at once ceases, and therewill be no dripping or draining of the sealing material on to the can end. As soon as the pressure forcing the sealing material out of the nozzle ceases, there can be no possible accumulation of the sealing material at the end of the nozzle through leakage l or otherwise, which Will .Cee-tinus. leerer 0r drip 0.11 to. the canVV end.-

Prior to our invention, nozzles have been used for coating can ends with the channel facing upward and the nozzle above the can end. ln such a type of coating machine, there is always more or less of a drip `or a string of coating material which is dragged across the face of the can end as it is moved from the chuck. By our improved arrangement of the discharge nozzle, this drawing of strings of sealing material across the face of the can end is entirely avoided. Furthermore, the sealing material in just the proper amount may be applied to the channel, and -will completely coat the channel all the way around to the outer edge of the curled portion of the can end. v f

The valve is closed as above noted, by means of the spring 29. t is opened to permit the discharge of the sealing material by a control mechanism which includes a lever 33. This lever has its inner end forked at 33a (Fig. 3), which forked end engages the valve stem. The outer end Vof the lever 33 is'directly yabove and rests on the arm 34 carried by the shaft 35. yihis shaft 35 carries a second arm 36 which is connected to a rod 37. The rod 37 is forked at 37a, 37a so as to straddle an operating cam 38. A roller l39 pivotally supported by the forks 37a, 37:L of the rod 37 bears on said cam. Thecam is mounted on the main shaft 5. y As the main shaft rotates, this cam will cause the rod to be raised and lowered, and this Vwill oscillate the shaft 35 which will raise and lower the arm 34. A spring 40 normally forces the rod 37 in a downward direction and holds the roller 39 in contact with the cam 38. The lever 33 intermediate its ends is fulcrumed on a standard 41. This 'standard 41 is capable of sliding vertically in a bracket 42. A spring 43 normally holds the standard in its lowermost position, and the end of the lever 33 in engagement with the arm 34. When the standard is free to move 'f in its guiding bracket, the oscillations 4of the arm 34 will raise and lower the eXtreme lefthand end of the lever 33, as viewed in Fig. 1, and this will impart no movement to the `valve stem. A pin 44 is provided for locking this standard so as to hold it from movement, and when the standard is locked so that itcannot move vertically, then it becomes a central fulcrum for the lever 33 on which the leverwill swing. When thelever swings on its fulcrum, the right-hand end'of the lever will be depressed by the upward movement of the arm 34, and this will cause the opening of the valve. The valve will be held open until the cam 33 swings the arm 34 downward, at which time the spring can close the valve. Y

The pin 44 which locks the standard and holds the same in fixed position, is controlled by a shaft 45 which carries at its outer end' an arm 46. The arm'46 extends underneath a control rod 47 which' extends up arm 46 will be raised, and there is nothing to restrain'its upward movement, so that the arm 46 is not depressed suliiciently -to cause the pin to grip and hold the standard from movement. When, however, a can end is placed on the lower chuck and clamped C thereagainst by the upper chuck, the downward movement of the two chucks with the end clamped between n them, will cause a downward movement of the rod 47. The head 49 on the rod 47 lies close beneath the can end, and the can end will prevent it from movement relative to the lower chuck.

Therefore, the rod 47 will move downward with the lower chuck and the lower end of the rod will engage the arm 46 which will oscillate the shaft 45 and cause the pin 44 to grip the 'standard 41, thus forming a fixed fulcrumsupport on which the lever 33 can oscillate to open the needle valve (see Fig. 3).

From the above it will be apparent that we have provided a coatingl machine for applying a sealing material to the channel of acan end, wherein just the right amount of sealing material may be coated ony the face of the channel, and the channel supplied with a coating from the desired inner position of the coating, all the way to the extreme end of the curled edge of the can end. It will further be noted that we have provided a coating machine wherein there is no dripping or forming of strings of coating material which are carried on to the can end as it is moved from the chuck which would result in unsanitary conditions.

It is obvious that minor changes in the details of` construction and arrangement of the parts may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what we claim as new and desire to secure by Letters-Patent, is,

l. A can end coating machine includingl in combination, upper and lower chucks rotating about a common axis, means for giving said chucks a relative movement toward and from each other to clamp Vandy release a can end, with the channel to be coated facing downwardly, a nozzle located beneath the can end and `disposed so as to discharge a coating of sealing material against the under face of the channel, a pipe attached to said nozzle through which sealing material may be supplied to the nozzle under pressure, a valve mechanism for controlling the discharge oi the sealing material from said nozzle, and means for rendering said valve mechanism ineffective when no can end is positioned for coating.

2. A can end coating machine including in combination, upper and lower chucks rotating about a common axis, means for giving said chucks a relative movement toward and from each other to clamp and release a can end, with the channel to be coated facing downwardly, a nozzle located beneath the can end and disposed so as to discharge a coating of sealing material against the under face of the channel, a pipe attached to said nozzle through which sealing material may be supplied to the nozzle under pressure, a valve mechanism for' controlling the discharge of the sealing material from said nozzle, and means for rendering said valve mechanism ineii'ective when no can end is positioned for coating, said valve mechanism including a rod located within the nozzle and adapted to close the nozzle at the extreme delivery end thereof.

3. A can end coating machine including in combination, upper and lower chucks rotating about a common axis, means for giving said chucks a relative movement toward and from each other to clamp and release a can end, with the channel to be coated acing downwardly, a nozzle located beneath the can end and ydisposed so as to discharge a coating of sealing material against the under face of the channel, a pipe attached to said nozzle through which sealing material may be supplied to the nozzle under pressure, a valve mechanism for controlling the discharge of the sealing material from said nozzle, and means for rendering said Valve mechanism ineffective when no can end is positioned for coating, said nozzle being disposed within the channel during coating but spaced from the bottom of the channel and adjacent the inner side of the channel.

4f. A can end coating machine including in combination, upper and lower chucks rotating about a common axis for clamping and rotating a can end; a coating nozzle disposed so as to discharge a coating of sealing` material against the face of the channelin the can end; a pipe connected to said nozzle through which sealing material may be supplied to the nozzle under pressure, a valve mechanism controlling the discharge of the sealing material from the nozzle, a curling roll for forming an initial curl in the edge of the can end disposed so as to engage said can end while the same is being rotated for coating, and means for moving said curling roll into and out of engagement with the can end.

5. A can end coating machine including in combination, upper and lower chucks ro- Y tating about a common axis for clamping and rotating a can end with the channel to be coated facing downwardly, a nozzle located beneath the can end and disposed so as to discharge a coating of sealing material against the under face of the channel, a pipe connected to said nozzle through which sealing material may be supplied to the nozzle under pressure, a valve mechanism for controlling the discharge of the sealing material from said nozzle, a curling roll adapted to engage the edge of the can end while rotating for coating and forming an initial curl in the edge or the can end and means for moving said curling roll into and out of engagement with the can end.

ln testimony whereof, we affix our signa tures.

FREDERICK A. PRAHL. HENRY A. FlNK. 

